import Vue from 'vue'
import Router from 'vue-router'
import Login from "./components/Login.vue";
import Home from "./components/Home.vue";
import Welcome from "./components/Welcome.vue";
import Users from "./components/user/Users.vue";

Vue.use(Router)

const router = new Router({
  routes: [
    { path: '/', redirect: '/login' },
    { path: '/login', component: Login },
    { 
      path: '/home',
      component: Home,
      redirect: '/welcome',
      children: [
        { path: '/welcome', component: Welcome },
        { path: '/users', component: Users}
      ]
     }
  ]
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表述放行
  //  next() 放行 next('login') 强制放行

  if (to.path === '/login') return next();
  // 获取 token
  const tokenStr = window.sessionStorage.getItem('token');
  if (!tokenStr) return next('/login');
  next();
})

export default router